Tooth for excavating dippers and the like



July 2, 1929. w. E. MILEY TOOTH FOR EXCAVATING DIPPERS AND THE LIKE Filed Oct. 8, 1926 2 Sheets-Sheet IN VEN TOR gn E. MIL E A Tram/5).

H WNW July 2, 1929.

v TOR. WEM/LEY Patented July 2, 1929.

UNITED STATES PATENT OFFICE.

WALTER E. MILEY. OF MARION, OHIO, ASSIGNOR TO THE MARION STEAM SHOVEL COMPANY, OF MARION, OHIO, A CORPORATION OF OHIO.

TOOTH FOR EXCAVAT'ENG DIPPERS AND THE LIKE.

Application filed October 8, 1926. Serial No. 140,242.

This invention relates to teeth for excavating dippers and the like.

Dipper teeth of this type are usually of a substantially wedge shape, that is, the thickness of the tooth increases rapidly from the utting edge rearwardlyv In service the lower portion of the front of the tooth wears away rapidly and the cutting edge, which originally is at the lower surface of the tooth, is gradually elevated until it is at the upper surface of the tooth. the tooth assuming a curved or sled runner shape. As the tooth wears back the cutting edge follows the inclined upper surface, thereof: and is ole atcd more and more above the lower surface of the tooth. The elevation of the cutting edge above the lower surtace otthe tooth gradually in reases the resistance offered to the penetration ot the bank by the tooth. and is otherwise objectionable, so that it is desirable to keep the cutting edge near the lower surface of the tooth as is possible. Further, such dipper teeth when new are, in some cases, provided with pointed cutting edges but as the tooth wears away the cutting edge hroadens out until it eventually become practically :1 str: ieht line extending across the full width of the tooth.

One object of the invention is to provide a dipper tooth of such a character that the cutting edge will he maintained close to the lower sin-lace ot the tooth throughout the lite oi' the tooth.

l'urther ohiect oi the invention is to pro-- ville such a dipper tooth with means for main taining a pointed cutting edge thereon as the tooth wears away.

.i. turther object of the invention is to provide a two-part dipper tooth having the contacting); portions thereof of such character and so arranged as to hold the two parts of the tooth lirmlv against relative movement.

i'urlher object ol the invention is to provide improved means {or securing the two parts oi the tooth in their a sembled positions.

Other objects ol the invention will appear as the tooth is described in detail.

In the accompanying drawings Fig. l is a t p plan view of a dipper tooth en'ibodyingr my invent ion: Fig. 2 is a bottom plan view of the some; Fig. 3 is a side elevation of such a tooth partly broken away: Fig. 4 is a section taken on the line t l ot Fig. looking; in the direction of the arrows; Fig. 5 is a section taken on the line 5-5 of Fig. 1, looking in the direction of the arrows; Fig. (3 is a section taken on the line 6-6 of Fig. 3, looking in the direction of the arrows; and Fig. 7 is a detail view of the head of the bolt. 7

In these drawings I have illustrated one embodiment of my invention and have shown the same as applied to a two-part dipper tooth but it will be understood that this particular Olllllfidlllltlll] has been chosen for the purposes of illustration only and that the various parts of the device may take various forms and that many features thereof may he embodied in a one-part dipper tooth as well as in av two-part tooth.

Various features of the present invention are shown and described in the application tor patent tiled by me April 22. 1925, Serial No. 24.957,which has now issued as Patent No. 1697.536 and the present application is a continuation of that application in so far as it relates to subject matter disclosed in that application.

In the particular embodiment of the invention here illustrated the tooth comprises a base 10 having means for securing; the same to an excavating device and, in the present instance. provided with a transverse slot to receive the forward edge of a dipper tront, as shown at 11. The rearwardly extending portions oi' the tooth are secured to this dipper front by means of rivets not here shown. The base has a relatively narrow 't'm'wardly extending portion or web 12 arranged centrally thereof and this forwardly extending portion is provided near the upper edge thereof with laterally opening; recesses or sockets These sockets are here shown circular in form but are described about a center spaced from the upper edge of the web a distance less than the length of the radius of the circle and consequently the upper portion of the sockets. as well as the lateral. portions thereof. are open. The circun'iterential wall of each socket tapers outwardly. each socket beingof greater diameter at its inner end than at its outer end. The tooth further comprises a point l t. the rear portion of which is of relatively great thickness and is bifurcated or slotted vertically to provide the same with rearwardly extending lateral portions 15 which are spaced apart to receive between them the torwardiy LX- tending; portion or web 12 ot the base. liach ot' the lateral portions 15 of the point has tit) an inwardly extending lug 18, which may be seated in the respective sockets 13. In order that these lugs or trunnions, may be inserted in the sockets 13 from above, the lugs are flattened on their upper surfaces and by moving the point of the tooth to an upright position the lugs will enter the sockets and when the point is moved to its lowermost or operative position with relation to the base the lugs will rotate in the sockets and will be. positively retained therein so long as the point is not again moved to an upright or elevated position with relation to the base. The base has near the lower surface thereof, and on opposite sides of the central forwardly extending portion 12, upwardly and forwardly inclined surfaces 17 and the lower portions of the rear ends of the lateral portions of the point are so shaped and arranged that they will engage these inclined surfaces of the base and a downward thrust on the forward portion of the point will tend to move the rear ends of the lateral portions thereof upwardly on the inclined surfaces 17 and will thus force the lugs 16 forwardly and downwardly in their sockets and provide a very rigid connection between these parts.

The base also has forwardly extending arms 18 arranged along the outer sides of the respective lateral portions of the point. these arms contacting with the lateral surfaces of the point to reinforce the same and hold the point against lateral movement with relation to the base. The base is provided on each side of the forwardly extending portion or web 12 thereof and near the rear end of this portion. with upwardly diverging lateral surfaces 19 with which the rear end portions 15 of the point will engage. The distance between the rear ends of the lateral portions of the point, when the point is cast or otherwise formed. is less than the greatest distance between the diverging surfaces 19 on the base and when the point. is moved downwardly into its operative position the lateral portions thereof will engage the diverging surfaces 19 with a wcdging action and will yield sufliciently to permit them to be moved into full contact with said surface. thus providing a very firm rigid connection between the parts. Likewise the arms 18 of the base engage the lateral surfaces of the point with a wedging action. As here shown. each arm has at its forward end a thickened portion or pad 20 and the adjacent portions of the point are also provided with thickened portions or pads 21 with which the pads 20 engage. The inner surfaces of the contact portions of the arms 18 are normally spaced apart a distance slightly less than the distance between the outer surfaces of the contact portions of the point and when the point is forced into its operative position the arms are spread slightly and engage the point with a very firm wedging action. Preferably the edges of the pads 20 and 21 are beveled, as shown in Fig. 4, to facilitate the proper engagement thereof.

The lateral portions 15 of the point are provided near their forward: ends with lugs or flanges extending inwardly therefrom but spaced apart to form a slot bet ween the same. The upper surfaces of these lugs are inclined, as shown at 23. and are spaced a short distance below the lower edge of the forwardly extending portion or web 12 of the base. A bolt 2t is arranged in the space between the lateral portions of the point with its head 27 confined between the inclined surfaces of the lugs 22, and the lower edge of the portion 12 of the base. The rear portion of this bolt extends through an opening in a rib or downwardly extending portion 25 of the base and has mounted thereon a nut 26 which. when tightened down, will cause the head of the bolt to ride over the inclined surfaces of the lugs, thereby forcing the point to its iow'crn-nrat position with relation to the base and drawing the rear ends of the lateral portions of the point tightly against the base. If desired, the head 27 of the bolt may be inclined to conform to the inclination of the upper surfaces of the lugs 22 and, as here shown, the lower corners of the dead are cut away, as shown at 28. to provide such inclined surfaces. By cutting away the corners only of the head the latter is provided with a rib it) which lies between the lugs and serves to properly position the bolt head with relation to the point and to hold the same against lateral displacement when the nut is tightened down thereon.

The forward port-ion of the point is relatively thin and flat. shown at :30, this por tion of the point being of substantially uniform thickness for a considerable distance to the rcar ol' the cutting edge 31 which is provided at the from end thereof. This thin front portion of the tooth is reinforced by a longitudinal rib 32 arranged centrally there-- of and having its upper edge inclined from a point near thc cutting cdgc 3i rcarwardly The upper surface of the forward portion of the tooth a so has thereon a plurality of pairs of diagonal ribs 3;}, the ribs of each pair being arranged on the respective sides of the central rib 32 and extending rearwardly and laterally therefrom at an acute angle to the length of the central rib. it will be noted that the lateral edges of the point converge forwardly at the forward end thereof to provide a pointed cutting edge and that the diagonal ribs 3-; are arranged substantially parallel with the resg'iective side portions of the cutting edge. The ribs 323 have their upper surfaces inclined upwardly and rearwardly from the upper surface of the front portion of the point. shown in Fig. 3. As the point wears away the lower surface of the front portion thereof will successively assume substantial- 1y thc shapes drown by the dotted lines Si in lit) Fig. 3, that is, this lower surface will grinluah ly take on a curved or sled runner shape and in time the cutting edge will be at the upper surface of the point. The forward portion of the point being of a substantially uniform thickness it will be apparent that the cutting edge will at no time be elevated greatly above the lower surface of the point, that is, it will be spaced from the lower surface of the point a distance equal to the thickness of the relatively thin front portion of the point. As the point wears back the cutting edge will approach and possibly enter the inclined surfaces of the first pair of ribs but before the cutting edge wears back sufficiently to materially elevate the cutting edge the metal between the rear edge of the rib and the worn surface of the point will become so thin that the rib as a whole will break away, thus establishing a new cutting edge at the point of severance. Inasmuch as the ribs converge forwardly this new cutting edge will be a pointed edge. As the point wears back the several ribs are successively broken away until the point is entirely consumed. hen this has been acc-on'iplished the old point is removed and a new one substituted therefor.

While I have shown and described one embodiment of my invention 1 wish it to be understood that 1 do not desire to be limited to the details thereof as various modifications may occur to a person skilled in the art.

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A tooth of the character described having a lower surface which is fiat throughout substantially its entire area, having at its rear end means for connecting it with an excavating device and having a relatively long for-- ward portion provided at its forward end with a cutting edge. the lateral parts of said forward portion being relatively thin and of a substantially uniform thickness.

2. A tooth of the character described having a lower surface which is flat throughout substantially its entire area, having a. thick rear portion, the upper surface of which is inclined downwardly and forwardly, said rear portion having means for connecting the same with an excavating device. said tooth also having a portion extending forwardly from said thick portion and provided at its forward end with a cutting edge. and having on its upper surface a longitudinal rib which increases in thickness toward the rear end thereof, those parts of said forwardly extending portion on the respective sides of said rib being relatively thin and of substantially uniform thickness.

A tooth of the character described. having a lower surface which is flat throughout substantially its entire area, having at its rear end means for connecting it with an exthe front end thereof to form a pointed cavating device and having a. relatively long forward portion provided at its forward end with a cutting edge, the lateral parts of said fm'ward portion being relatively thin and of a substantially uniform thickness, said lateral parts having on their upper surfaces a plurality of diagonal ribs.

4. A tooth of the character described having at its rear end means for connecting it with an excavating device and having a relatively thin forward portion of substantially uniform thickness and provided at its forward end with a cutting edge, said forward portion having on its upper surface a longitudinal central rib and other ribs arranged on the respective sides of said longitudinal rib and extending at acute angles thereto.

5. A tooth of the character described, having at its rear end means for connecting it with an excavating device and having a relatively thin forward portion of substantially uniform thickness and provided at its forward end with a cutting edge, said forward portion having on its upper surface a plurality of pairs of forwardly converging ribs.

3. A dipper tooth of the character described having at its rear end means for connecting it with an excavatin device and having a relatively thin forward portion of substantially uniform thickness, sa d forward portion having its lateral edges converging at the front end thereof to form a pointed cutting edge and also having on its upper surface forwardly converging ribs arranged substantially parallel with the respective converging lateral edges thereof.

7. A dipper tooth of tile character described having at its rear end means for connecting it with an excavating device and having a relatively thin forward portion of substautially uniform thickness, said foru ard portion having its lateral edges con verging at cut ting edge and also having on its upper surface a longitudinal central rib and a plurality of diagonal ribs extending rearwardly and laterally from the opposite sides of said central rib.

S. A dipper tooth of the character described having at its rear end means for connecting it with an excavating device and having a relatively thin forward portion of substantially uniform thickness, said forward portion having its lateral edges converging at the front end thereof to form a pointed cut ting edge and also having on its upper surface a longitudinal central rib and a plurality of diagonal ribs extending rearwardly and laterally from the opposite sides of said central rib, said diagonal ribs having their upper surfaces inclined upwardly and rearwardly from the upper surface of said forward portion of said point.

9. A tooth of the character described. having a lower surface which is flat throughout llU til)

til)

substantially its entire area and comprising a base adapted to be secured to an excavating ocvu-e, and a point having at its rear end means tor detachablv securing the same to said base and having a relativel thin for-' ward portion provided at its forward end with a cntt ing edge, the late 'al. parts of said Forward portion being of a substantially uni form thickness.

10. In a tooth of the cl a r: rter described, a base adapted to be secured to an excavating device, and a point having at its rear e- :l means for attaching the same to said base and having a relatively thin l'oi'ward port ion of substantially uniform thickness and provided at its forward end with a pointed ting edge, said tin-ward portion having on upper surface a plnrailt v of pairs of forwardl v converging ribs.

ll. In a tooth of the character described a base adapted to be secured to an excavating device having a relativelv narrow l' rwardl extending central portion and having inclined surt'accs at th rem tive sides of said central portion, and a point in wardl extending lateral portapart to receive bet ween then extending portion of said base, s: portions of said pain: bent wage said inclined anrihces oi wedging action when sa to its operative position wi 1:2. baa adapted to be seemed to an excav device and having a relativelv narrow torwardlv extendin central portion and havir upwardlv diver iaterni urfaces near the rear end of sa 'l oiwi'ardiv er-itendi li n. and a point having rearwardlv extendlateral por ns spaced apart to receive biween them said forwardly extending tion of said base and having thenrar portions awanged to env id divcriz'ing .Hi'lht'cs when said point is moved to its operative position with relation to said base, and neans l'ol retaining sand point in a d ope ative position.

1-"). In a tooth ol the charact r ea-ribe: a base adapted o be secured to devi e and having a rriativel v wardlv extending central porti n upwardly diverging lateral arl'aees near the rear end of said t'orwardlv extend ng portion, and a point having rearwardlv extenlb ing lateral pin-lion s eed apart to receive between them said t'orwardlv extendinzi' portion of said base and having their rear end portions arranged to engage said diverging surfaces when said point is moved to it onerative position with relation to said base, said end portions being norn lv spaced apart a distance less than the greate t dist; a e between said d iverging surfaces and being vieldable to permit them to be moved into 51 l engagement with said diverging sur 'aces. and means for retaining said point in said operative position.

when said point is moved to its operative position with relation to said base, and means for retaining said point in said operative position.

153. in a tooth of the character described, a ba e adapted to be secured to an ex a ating device and having a relatively narrow t'orwardlv extending central portion and a point havii reaiwvardly extending lateral portions spaced apart to receive between them said torvvardlv extending portion of said bas and said base having arms extending torwardlv along the onter sides of the respective lateral portions of said point and having their forward end portions arranged to engage the sides of said point with a wedging iontaet when said point is moved to its oprrat'ive position with relation to said base, said end portions of said arms being normally spaced apart a distance less than the distance between the cont n'tions of said point, said arms being ie da dc to permit said end portions thereof to be moved into engagement with said cont: ct portions of said point. and means for retaining said point in said opera tive position.

ltt. .ln a t oth f act pi i the character described. a

ward extending portion of said base, said lateral portions ot' said point being arranged to engage said i e with a wedging action when said point is moved to its operative position with relation to said base, and said base having arms extending forwardly along the outer sides oi' the respectiv lateral portions of said point and having their 'lorward end portions arranged to engage the side of said point with a edging contact when said point is moved to its operz tive position with relation to said base, and means for retaining said point in said operative position. 7

17. in a tooth of the character described. a base adapted to be secured to an exca ating device and having a relatively narrow torwardly extcni'ling central portion and having ltit) upwardly diverging lateral surfaces near the rear end of said forwardly extending portion, and a point having 'earwardly extending lateral portions spaced apart to recei ve. between them said forwardly extending portion of said base and having their rear end portions arranged to engage said diverging surfaces when said point is moved to its operative position with relation to said base, said end portions being normally spaced apart a distance less than the greatest distance between said diverging surfaces and being yieldable to permit them to be moved into full engagement with said diverging surfaces, said base having arms extending forwardly along the outer sides of the respective lateral portions of said point and havin; their forward end portions arranged to engage the sides of said point, said end portions of said arms being; normally spaced apart a distance less than the distance between the contact portions of said point and said arms being yieldable to permit said end portions thereof to be moved into engagement with said contact portions of said point, and means for retaining said point in said operative position.

18. In a tooth of the character described, a base adapted to be secured to an excavating device and having a relatively narrow forwardly extending portion, and a point having); rearwardly extending lateral portions spaced apart to receive between them said forwardly extending portion of said base, said base having upwardly and forwardly inclined surfaces arranged on the respectixe sides of said forwardly extending portion thereof and said lateral portions of said point having their rear ends shaped to engage said inclined portions when said point moved to its operative position with relation to said base. said base having a clearance above said inclined surfaces to permit the rear ends of the lateral portions of said point to move up-- wardly along said inclined surfaces when downward pressure is applied to the forward portion of said point. and means for retainiinr said point in said operative position.

it). in a tooth of the character described. a base adapted to be secured to an excavating device and having: a relatively narrow forwardly extending portion provided near the top thereof with a socket, and a point having its rear portion bifurcated to embrace said forwardly extending portion of said base and having a part to enter said socket and to rotate therein when said point is moved to its operative position with relation to said base, said base having upwardly and forwardly inclined surfaces arranged on the respective. sides of said forwardly extending portion and near the bottom of said base, and the rear ends of the lateral portions of said point being arranged to engage said inclined surfaces when said point is in its operative position and to be moved upwardly along, said inclined surfaces when downward pressure is applied to the forward portion of said point, and mcansto retain said point in its operative position.

20. la a tooth of the cliaractcr described. a base adapted to be secured to an excavating den 1w and hav ng a relatively narrow forwardly (attending portion, a point having rcarwardly evtcmlin lateral portions spaced apart to receive between them the forwardly extending portion of said base, said lateral portions having inwardly extending portions pro red with inclined upper surf ces spaced from the lower edge of said forwardly extei'idinn' portion of said base, and a bolt arranged between said lateral portions of said point with its head confined between said inclined surfaces and said edge of the forwardly extending portion of said base and with its rear portion extending through a part of said base.

21. In a tooth of the character described, a base adapted to be secured to an excavating device and having a relatively narrow forardly extendinc portion, a point having rearwardly extending lateral portions spaced apart to receive between them the forwardly extending portion of said base, said lateral portions havirg;- inwardly extending portion-1 provided with inclined upper surfaces spaced the lower edge of said forwardly ex ending portion of said base, and a bolt ar- 2 ed between said lateral portions of said t with its head coni'ined between said inclined 'nrfacc and the edge of the forwardly cxtemling portion of said base. the head of said bolt being; provided with inclincd surfaces to cooperate with the first mentioned ia-liued surface-i and, having a guide porio arranged between said inclined surfaces, and the rear portion of said bolt extending, through a part of said base.

in testimony whereof, I aflix my signature hereto.

lVAL'llCR E. MIKEY,

Cir 

